See also: pbo and PbO English Noun PBO (countable and uncountable, plural PBOs) (organic chemistry) Initialism of piperonylbutoxide. Initialism of polybenzobisoxazole. (Canada) Initialism of Parliamentary Budget Officer. Initialism of public benefit organization. Initialism of paperback original. Initialism of pension benefit obligation. Proper noun PBO (Philippines) Initialism of Pinoy Box Office. Anagrams BOP, BPO, Bop, OBP, bopRemove adsWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads